You need to restore all of your databases and in many cases need to buy a new Windows Server OS license. However, this method is time consuming and costly. This is essentially the same as performing a new installation. Thereby giving you a more stable new installation. People who prefer the clean upgrade say you minimize the register and system corruption that eventually creeps into all Windows installation. Each different tact has their advantages. Other people prefer performing in-place upgrade. Some people recommend performing a full backup followed by a clean install of SQL Server on a new operating system. There are two basic strategies for upgrading to a new SQL Server release. SQL Server 2014’s new In-Memory OLTP, with its 2x-30x performance improvements, provides a pretty compelling reason to migrate to SQL Server 2014-in spite of the fact that SQL Server 2014 was released just two years after the last SQL Server 2012 release.
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